You could always run a longer wire (proper gauge!) to a more suitable ground point.

There's also nothing wrong with drilling your own ground point, remember. Just don't drill an outer panel that goes through to the outside of the car, and if it's a point that's going to get wet (such as inside a wheel well) you'll need to protect it with RTV silicone.

Best would be a through-metal bolt of some kind, so that you can cinch both sides of the connection with lock washers.